Questions tagged [arthropod]

An arthropod is an invertebrate animal having a segmented body, jointed appendages and exoskeleton. Arthropods form the phylum Arthropoda, which includes the chelicerates (horse shoe crabs and arachnids), insects, myriapods, and crustaceans. Use 'entomology' tag if the question is specifically about Insecta.

Filter by
Sorted by
Tagged with
29
votes
1answer
5k views

What is this strange sea creature we found on the beach?

We found this on a beach in North Devon, UK. I've never seen anything like it. There's a yellowy-ball in the middle with 5 pointed shells attached to it, each of which seems to have a single "leg&...
25
votes
1answer
4k views

Do ants really find the shortest path to a food source?

There exist many computational intelligence algorithms based on the observation that ants deposit pheromones in such a way that they find the shortest path to food sources. This logic is used to ...
14
votes
1answer
310 views

What are these (eggs?) ? ( Location - India )

The picture can be zoomed in on clicking Description: There are 24 of them, each ovoid, 1mm long and attached to the switch's frame by suction cups connected by tubes. They are secured to the base ...
14
votes
1answer
405 views

Name and Behaviour of Arthropods near a Cactus

Background Story I have a small, old cactus on my sunny, south-facing window sill in southern Germany. Since a few years, small black dots gathered around its pot. At first, I thought the dots were ...
7
votes
1answer
222 views

Identification of an insect found near Shirdi, Maharashtra

I found the insect nside house near Shirdi, Maharashtra. I have captured the image
7
votes
1answer
1k views

Is this a saltwater millipede?

I spotted this millipede-like creature in Hervey Bay, Australia at low tide, just kind of hanging out at the bottom of a small saltwater tidepool. It's several inches long, composed of a large ...
6
votes
1answer
485 views

What are these near microscopic white bugs from my comb?

I saw a whole bunch of white bugs crawling on my comb in the medicine cabinet, they didn't photograph well but I did manage to get a bunch of them in mineral oil and eventually take some micrographs. ...
5
votes
2answers
1k views

What insect is this?

I found it in Russia. Where do they usually live? What do they eat? Full length is approximately 2 cm.
5
votes
1answer
67 views

Is a female spider, well-fed by sexual cannibalism, less likely to mate again?

The Wikipedia page on sexual cannibalism (e.g. female spiders eating their mates) currently has a statement that sounds wrong to me, but I don't feel expert enough to edit it out: An additional ...
5
votes
2answers
396 views

Why do Centipedes always have an odd number of pairs of legs?

Furthermore, centipedes are within the Myriapoda, a subphylum of arthropods which also contains millipedes. Do millipedes also have an odd number pair of legs?
5
votes
1answer
78 views

What kind of Brazilian Arthropoda is this?

It looks like a Diplopoda, but I've never seen anything like that. A friend took those pictures in the Brazilian Cerrado (Goiás state, Brazil) these days (October, start of rainfall in Spring). It was ...
4
votes
1answer
1k views

What are these tiny, swarming, jumping bugs?

I built a small plywood box in my yard (on Long Island, NY, USA) for some stray cats about a year ago. I didn't bother waterproofing the box, and so over time the box has gotten damp. About two weeks ...
4
votes
1answer
75 views

What arthropod is in the picture?

I am from Philippines and I found this in my room. This arthropod has 6 legs and have a bit long Chelicerae like spiders that can fold to hold its food. It's about half an inch long. It also looks ...
4
votes
2answers
715 views

Did insects and arachnids diverge before or after moving to land?

Question: Are arachnids and insects so distantly related that they were already diverging before their (independent) emergence(s) on land? I am curious to know what the fossil record and molecular ...
4
votes
1answer
400 views

What species is this orange and black caterpillar from Costa Rica?

Does anyone know what type of caterpillar this is? I don't know much about them. Pictured it in January in Costa Rica cloudforest (Monteverde) and am using it in a speech for visiting Costa Rica. ...
4
votes
1answer
1k views

Taxonomy: Categorising Collembola [closed]

Observe: In some rows (Order, Family), the third column reveals a discerning physical characteristic or body type (...
4
votes
0answers
211 views

Costa Rican Centipede Species

What species of centipede is this? Found it 3 miles from San Ramón, Costa Rica
4
votes
0answers
130 views

Can anyone identify this garden orb weaver spider?

Found in low foliage in Harare Zimbabwe. Argiope flavipalpis or A.levi
3
votes
2answers
99 views

Identifying this spider

I think this is a spider. 8 legs, 2 body sections, and 2 really long Palos? Anyways, can anyone identify this bug, or point me to a resource where I could classify it?
3
votes
2answers
1k views

What is (probably) the closest living relative of the trilobite?

The trilobites vanished from the fossil record many millions of years ago, but they were obviously arthropods of some sort. Do we know which animals are their closest living relatives? I've heard both ...
3
votes
2answers
456 views

Tiny white very hard cell bug! Please help to identify!

I found these bugs walking on the floor/ wall and on my laptop. And unfortunately I think they could be in my bed, too, since I bring my laptop to bed sometimes. I live in a big city in the ...
3
votes
1answer
87 views

is this a brown recluse spider?

What kind of spider is this? SE Michigan, light brown color, second picture less focused but w tape measure for scale. Thank you!
3
votes
1answer
60 views

Why is this spider wound in such a dense web?

I saw this thing yesterday on my window curtain, and I've been wondering what this is. It looks like a dense network of spider web, and the spider inside it is visible. I thought the spider was dead, ...
3
votes
2answers
890 views

ID for red millipede swarm near my place

Location:Hyderabad,South India. These worms usually come out when it rains,these worms are the most common ones any help in figuring out them,they come in groups too.
3
votes
1answer
159 views

Identifying a spider from coastal Virginia

A spider recently put up a web in my room in coastal Virginia, USA (on the left in the photo). Rounder/taller body than most species I've seen. Dark brown, not quite solid-color coloration. If laying ...
3
votes
0answers
87 views

Difference between haemocoel and coelom

I am looking for an embryological perspective on the following question. I know about coelom derivation, but I want to know how haemocoel is derived and how it is fundamentally different from coelom. ...
3
votes
0answers
80 views

Are These Oyster Crabs?

I found these crabs at the end of September, 2018. My family was vacationing on the coast of Lopez Island in the Pacific Ocean off of Washington State. I have been trying to figure out what they are ...
3
votes
0answers
46 views

Were there any terrestrial species in the ancestry of all crustaceans?

To the exception of woodlice, Crustaceans live in aquatic (marine or freshwater) environments. Crustaceans are arthropods which is an immensely diverse taxon. Many arthropods live in terrestrial ...
3
votes
0answers
60 views

Can Anyone Identify this Tissue?

I am hoping someone can identify the image below My wife felt a bug bite her and found this in her hair now she's worried that it was a tick. the photo is at 40X under microscope. I'm guessing it's ...
3
votes
0answers
40 views

Identify this larvae that lives on a musrhoom?

I was in the forest near the Rhone river in France and I uncovered some mildewy wood bracket fughi (Ganoderma) on a fallen willow tree. It was a scene from a sci-fi film. some arthropod larvae of 2-...
3
votes
0answers
103 views

Identification of Unknown Insects found in landfill (spider like)

Could someone help me to identify the following spider-like insects? They are very small, so I used a macro lens to capture them. I have tried to capture them as clearly as possible. They are about ...
3
votes
0answers
190 views

Terrarium Compatibility: Millipedes with Carnivorous Plants?

I have a child that loves his large millipedes (Desert Millipedes) and Venus Fly Traps. He's also been wanting to get some Sundew Savages. Given this little collection and his real enjoyment of ...
3
votes
0answers
52 views

How do spiders get silk from their spinnerettes?

I'm 13 and writing a report on spiders. How do they use the silk protein gel from the spinnerets? How does it get from the spinnerets to the web? P.S. I know how silk is created, all the way up until ...
2
votes
2answers
318 views

What is this insect in this picture? [duplicate]

I recently found this insect near our veranda wall. What insect is this ? Is it poisonous? As you can see, it has multiple legs fine as hair, but it is not like a common millipede or centipede. I ...
2
votes
1answer
113 views

Are any arthropods poisonous to the touch?

I'm particularly interested in whether any insects are poisonous to the touch. Note that toxic-bristled caterpillars are actually venomous, since in all species I'm familiar with, the bristles ...
2
votes
1answer
71 views

Identify arthropod with many legs in Mumbai

Can someone please identify this ~5 cm long arthropod? I've been finding one of these every 2-3 days inside my apartment ever since rainy season started here in Mumbai (June). The bulb portion is its ...
2
votes
1answer
106 views

Spider identification (Caribbean)

I live in the Caribbean (Puerto Rico) and found this spider in my garage. Is it venomous? It measures about 8 inches as a whole.
2
votes
1answer
973 views

Why are spiders afraid of flies caught in their web?

I recently noticed a fly got caught in a spider web in my house. The fly was very energetic and, even though caught, continued to flap it's one wing (which I think might have been partially free) with ...
2
votes
1answer
38 views

How long might a tick be on a body before biting?

I understand that a tick must be attached for roughly 24+ hours before presenting a danger of transmitting Lyme Disease. However, I am wondering how long a tick might be on my body before actually ...
2
votes
1answer
344 views

What kind of spider is this and is it poisonous?

A brown furry diamond shape on its back and brown joints all on black body. Caught entering my house in Trinidad (small island off South America) -- killed the first one, this is the second.
2
votes
0answers
75 views

Evolution of the unique mating system of the scorpion Androctonus australis

Sperm transfer in the scorpion Androctonus australis involves a sclerotized spermatophore, which is formed in the paraxial organs of the male reproductive system. The right paraxial organ produces the ...
2
votes
0answers
20 views

Can Chilopoda “vocalize” or produce sound for the express purpose of communication, as opposed to sound as a byproduct of other movements?

Is there any species of Chilopoda that can "vocalize" or or otherwise produce sound for the express purpose of communication, as opposed to sounds it might create as a byproduct of other movements ...
2
votes
0answers
90 views

what is this bug ? i found it on bed 2 times

What is this 1mm long bug I found on my bed in Egypt? Here is its back photo
2
votes
0answers
96 views

Can someone identify this spider?

Saw this on the street in the UK. To my eyes it looked and moved distinctly tarantula-y (although I don't have any firsthand experience with them) which I'm pretty sure we don't have any of natively. ...
2
votes
0answers
501 views

Which species of centipede is this and is it dangerous to cats?

My cat was "playing" (aka torturing) with this centipede: I tried to measure its length with a measurement tape: Since I know some species of centipede can be poisonous, I tried to find if ...
1
vote
2answers
2k views

How do legs of tiny insects/spiders like mosquito/Opiliones work?

I think I understand how legs of humans work. We have bones to which muscles are attached. Muscles can only contract / relax. By the combination of many different muscles we can make complex movements:...
1
vote
1answer
53 views

Arthropod identification request (a spider with no legs?)

My mother sent me a picture of a creature she encountered and couldn't identify. It looks kind of a like a spider - a mostly black body, about 1cm in size, with white specks - except without any ...
1
vote
1answer
31 views

Absence of cytoplasmic Intermediate Filaments in Arthropods

Cytoplasmic intermediate filaments such as vimentins support the architecture of the cell and have been known to aid signaling processes. However, as in this article, it is stated that out of all ...
1
vote
2answers
99 views

What species of spider is this? Could anyone help

This image was taken in assam, India. The size was around 1cm. Could anyone help identify?
1
vote
1answer
37 views

How do we know how long hermit crabs live in the wild?

This article states that hermit crabs in the wild are extremely difficult to track because they constantly change shells and even gender. Later in the article, they say that hermit crabs can live 4 ...